We started all this around the time she got mobile, and finished before she was a year old. We mounted all the TVs on the wall. In our bedroom, the dresser is too high for our almost 3 year old daughter to reach the components. We have a gate preventing her from going upstairs to the game room. The equipment there is in a console, and when she is up there, it stays closed, and she is always supervised as it is the least baby/toddler proofed room. The living room is where we all spend most of our time. The TV is mounted, as is the Sonos. We have a Joey cable box, and cheap Sony BD player. They sit on top and at the back of the console. I moved my gaming systems upstairs so that we could keep just the minimum where she would spend the most time. When my daughter turned one, she loved getting into the console, and while it was mostly empty, the doors had glass, and she kept slamming them shut and trying to climb into the empty shelves. Since her toys kept ending up in the room as well, I took the doors off the console, and we put some canvas bins in the console. Now her toys are in the bins, and they provide some distraction. When she gets older, we can arrange things back to they way they were before.
On a side note, my mother in law has a low console, and the TV is not mounted. When we were there this last weekend, my daughter kept touching the TV screen. I kept reminding her not to touch it, but that did not help. When ever she walked by, she would touch it. It is also not secured to the wall, so I may be mounting another TV in the near future.